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research article

Non-diffusive transport of suprathermal ions by intermittent turbulent structures

Furno, I.  
•
Bovet, A.
•
Fasoli, A.
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2016
Plasma Physics And Controlled Fusion

We report on recent experimental, numerical and theoretical investigations of suprathermal ion transport and turbulent plasma dynamics in TORPEX. TORPEX is a toroidal device in which field-aligned blobs are intermittently generated and propagate across a confining magnetic field. Suprathermal ions are locally injected using a miniaturized source and detected using gridded energy analyzers. We show evidence for subdiffusive and superdiffusive transport of suprathermal ions, using an unprecedented combination of uniquely resolved three-dimensional measurements and first-principles numerical simulation. We present time-resolved measurements of suprathermal ion current fluctuations, which exhibit a clear causality relation with blobs, as revealed by a transfer entropy method for the superdiffusive case. This link is further investigated by using a conditional sampling technique, which allows resolving the cross-field dynamics of both blobs and the suprathermal ion beam, revealing that suprathermal ions experiencing superdiffusive transport are associated with bursty displacement events, resulting in highly intermittent time traces. This work links observations usually inaccessible in fusion devices and astrophysical plasmas, namely energy resolved three-dimensional time-averaged measurements, with Eulerian time-resolved measurements, which are often the only accessible measurements in such systems.

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Type
research article
DOI
10.1088/0741-3335/58/1/014023
Web of Science ID

WOS:000368471900024

Author(s)
Furno, I.  
Bovet, A.
Fasoli, A.
Gauthey, C.
Gustafson, K.
Ricci, P.
Van Milligen, B. Ph
Date Issued

2016

Published in
Plasma Physics And Controlled Fusion
Volume

58

Issue

1

Article Number

014023

Subjects

TORPEX

•

turbulence

•

blobs

•

suprathermal ions

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
February 16, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/123799
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